Discharge protection circuit for rotary table torque motor

Abstract

A discharge protection circuit for a rotary table torque motor relates to the technical field of rotary tables, and when the rotary table rotates rapidly and starts and stops, the torque motor generates a large amount of reverse electromotive force, the voltage of a rotary table power supply VIN rises, the output end of a voltage comparator outputs a low level signal, a PNP type triode and an MOS tube are conducted, and the rotary table power supply VIN is discharged to a resistor XII. And when the power supply VIN returns to normal, the output end of the voltage comparator outputs a high level, the PNP type triode and the MOS tube are switched off, and the power supply VIN of the rotary table normally supplies electric energy to the torque motor of the rotary table. The situation that the motor driver and the main control circuit are impacted by a large amount of reverse electromotive force generated in the rapid rotation and start-stop process of the rotary table torque motor is effectively avoided, and a rotary table main control board and a driver are effectively protected against damage.

Description

Technical Field

[0001] The utility model relates to the technical field of turntables, in particular to a turntable torque motor discharge protection circuit. Background Art

[0002] At present, informatization is the main feature of the new combat mode on a global scale, and information capability has become the primary indicator for measuring combat capability and key defense capability. The urgent need for information reconnaissance and surveillance means to improve information capability has driven the information reconnaissance method, which is the primary link in obtaining information capability, to change from "single" to "diversified". As the "eyes" of the training ground command, information reconnaissance methods often use radar reconnaissance, optical reconnaissance, sonar reconnaissance, electronic reconnaissance and other reconnaissance technical means. Therefore, for turntables equipped with radar and electric frame equipment, the turntable is required to rotate quickly and start and stop quickly. During the rapid rotation and startup of the turntable, the torque motor will generate a large amount of reverse electromotive force, which will impact and damage the power supply part of the drive board and the main control board, causing significant economic and property losses to the turntable equipment. Summary of the invention

[0003] In order to overcome the deficiencies of the above technologies, the utility model provides a circuit which discharges the excess reverse electromotive force through a discharge circuit to play a protective role.

[0004] The technical solution adopted by the utility model to overcome the technical problems is:

[0005] A turntable torque motor discharge protection circuit, comprising:

[0006] A power conversion chip, whose D pin is connected to the turntable power supply VIN, whose FB pin is respectively connected to one end of resistor I and one end of resistor II, and the other end of resistor I is respectively connected to the power supply VCC, one end of resistor IV and the S pin of the power conversion chip;

[0007] A voltage reference chip, wherein the pin 2 is connected to the other end of the resistor IV, the pin 3 is grounded, and the pin 1 is connected to the pin 2 of the voltage reference chip;

[0008] A voltage comparator, wherein the non-inverting input terminal thereof is connected to pin 1 of the voltage reference chip via a resistor VI, and the inverting input terminal thereof is respectively connected to one end of a resistor V and one end of a resistor VII, the other end of the resistor V is connected to the turntable power supply VIN, and the other end of the resistor VII is grounded;

[0009] A PNP transistor, the base of which is connected to one end of the resistor XI and the cathode of the diode IV respectively, the other end of the resistor XI is connected to the turntable power supply VIN, the anode of the diode IV is connected to the output end of the voltage comparator via the resistor IX, and the collector of the PNP transistor is connected to the turntable power supply VIN;

[0010] The gate of the MOS tube is respectively connected to one end of the resistor X and one end of the resistor XI, the other end of the resistor X is connected to the emitter of the PNP transistor, the other end of the resistor XI is grounded, the drain of the MOS tube is connected to the turntable power supply VIN via the resistor XII, and the source is grounded.

[0011] Furthermore, the power conversion chip is a LNK304DN power conversion chip.

[0012] Furthermore, the D pin of the power conversion chip is respectively connected to the cathode of diode I, one end of capacitor I and one end of capacitor II, the anode of diode I is connected to the turntable power supply VIN, and the other end of capacitor I and the other end of capacitor II are both grounded.

[0013] Furthermore, it also includes capacitor III, diode II, capacitor IV, inductor, and diode III. One end of capacitor III is connected to the BP pin of the power conversion chip, and the other end is connected to the S pin of the power conversion chip. The cathode of diode II is connected to the S pin of the power conversion chip, and the anode is grounded. Capacitor IV is connected in parallel with diode III. The anode of diode III is connected to the other end of resistor I, and the cathode is connected to the S pin of the power conversion chip via the inductor.

[0014] Furthermore, it also includes a capacitor V and a resistor III. The capacitor V and the resistor III are connected in parallel with each other, and one end of the capacitor V is connected to one end of the resistor IV, and the other end is grounded.

[0015] Furthermore, it also includes capacitor VI, capacitor VII, capacitor VIII, resistor VIII and capacitor IX, one end of capacitor VI is grounded, and the other end is connected to pin 2 of the voltage reference chip, one end of capacitor VII is grounded, and the other end is connected to the positive input terminal of the voltage comparator, one end of capacitor VIII is grounded, and the other end is connected to the inverting input terminal of the voltage comparator, and resistor VIII is connected in parallel with capacitor IX, and one end is connected to the positive input terminal of the voltage comparator, and the other end is connected to the output terminal of the voltage comparator.

[0016] Furthermore, the voltage reference chip is a TL431AIDBZR voltage reference chip, and the voltage comparator is a LM2903DR2G voltage comparator.

[0017] Furthermore, it also includes a capacitor X and a capacitor XI. After the capacitor X and the capacitor XI are connected in parallel, one end of the capacitor X is connected to the collector of the PNP type transistor, and the other end thereof is grounded.

[0018] Furthermore, it also includes a diode V, which is connected in parallel with the resistor XII, the cathode of the diode V is connected to the drain of the MOS tube, and the anode of the diode V is connected to the turntable power supply VIN.

[0019] Furthermore, resistor Ⅻ is a 100W / 10R aluminum shell resistor

[0020] The beneficial effects of the utility model are as follows: when the turntable rotates rapidly and starts and stops, the torque motor generates a large amount of reverse electromotive force, the voltage of the turntable power supply VIN increases, the voltage comparator outputs a low-level signal, the PNP transistor and the MOS tube are turned on, and the turntable power supply VIN is discharged to the resistor XII. When the power supply VIN returns to normal, the voltage comparator outputs a high level, the PNP transistor and the MOS tube are turned off, and the turntable power supply VIN normally provides electrical energy to the torque motor of the turntable. It effectively avoids the situation in which a large amount of reverse electromotive force generated by the turntable torque motor during rapid rotation and start and stop impacts the motor driver and the main control circuit, and effectively protects the turntable main control board and the drive from being damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a circuit structure diagram of the utility model;

[0022] In the figure, 1. diode I 2. capacitor I 3. capacitor II 4. power conversion chip 5. capacitor III 6. diode II 7. resistor I 8. resistor II 9. capacitor IV 10. inductor 11. capacitor V 12. diode III 13. resistor III 14. resistor IV 15. capacitor VI 16. voltage reference chip 17. resistor V 18. resistor VI 19. capacitor VII 20. resistor VII 21. capacitor VIII 22. voltage comparator 23. resistor VIII 24. capacitor IX 25. capacitor X 26. capacitor XI 27. resistor IX 28. diode IV 29. resistor XI 30. PNP transistor 31. resistor X 32. resistor XI 33. MOS tube 34. diode V 35. resistor XII. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1 The utility model is further described.

[0024] A turntable torque motor discharge protection circuit comprises: a power conversion chip 4, whose D pin is connected to the turntable power supply VIN, whose FB pin is respectively connected to one end of a resistor I 7 and one end of a resistor II 8, and the other end of the resistor I 7 is respectively connected to the power supply VCC, one end of a resistor IV 14 and the S pin of the power conversion chip 4; a voltage reference chip 16, whose 2 pins are connected to the other end of the resistor IV 14, whose 3 pins are grounded, and whose 1 pins are connected to the 2 pins of the voltage reference chip 16; a voltage comparator 22, whose non-phase input end is connected to the 1 pin of the voltage reference chip 16 via a resistor VI 18, whose inverting input end is respectively connected to one end of a resistor V 17 and one end of a resistor VII 20, the other end of the resistor V 17 is connected to the turntable power supply VIN, and the other end of the resistor VII 20 is grounded; a PNP transistor 30, whose base is respectively connected to one end of a resistor XI 29 and a diode IV The cathode of diode IV 28 and the other end of resistor XI 29 are connected to the turntable power supply VIN, the anode of diode IV 28 is connected to the output end of voltage comparator 22 via resistor IX 27, the collector of PNP transistor 30 is connected to the turntable power supply VIN; MOS transistor 33, its gate is respectively connected to one end of resistor X 31 and one end of resistor XI 32, the other end of resistor X 31 is connected to the emitter of PNP transistor 30, the other end of resistor XI 32 is grounded, the drain of MOS transistor 33 is connected to the turntable power supply VIN via resistor XII 35, and its source is grounded. The power conversion chip 4 outputs a VCC power supply, and the VCC power supply generates a 2.5V reference voltage after passing through the voltage reference chip 16, and the reference voltage is provided to the voltage comparator 22. When the turntable rotates rapidly and starts and stops, the torque motor generates a large amount of reverse electromotive force, the voltage of the turntable power supply VIN increases, the output end of the voltage comparator 22 outputs a low-level signal, the PNP transistor 30 and the MOS tube 33 are turned on, and the turntable power supply VIN is discharged to the resistor XII 35. When the power supply VIN returns to normal, the output end of the voltage comparator 22 outputs a high level, the PNP transistor 30 and the MOS tube 33 are turned off, and the turntable power supply VIN normally provides power to the torque motor of the turntable. It effectively avoids the situation that a large amount of reverse electromotive force generated by the turntable torque motor during rapid rotation and start and stop impacts the motor driver and the main control circuit, and effectively protects the turntable main control board and the drive from being damaged. Resistors I 7 and II 8 play a voltage dividing role, resistor IV 14 plays a current limiting role, resistor VI 18 plays a current limiting role, and resistor V 17 and resistor VII 20 form a voltage dividing circuit. The resistor XI 29 plays a pull-up role, the diode IV 28 plays a rectifying role, the resistor IX 27 plays a current limiting role, and the resistor X 31 and the resistor XI 32 both play a pull-down role.

[0025] In one embodiment of the present invention, the power conversion chip 4 is a LNK304DN power conversion chip, the voltage reference chip 16 is a TL431AIDBZR voltage reference chip, the voltage comparator 22 is a LM2903DR2G voltage comparator, and the resistor XII 35 is a 100W / 10R aluminum shell resistor.

[0026] In one embodiment of the utility model, the D pin of the power conversion chip 4 is respectively connected to the cathode of the diode Ⅰ 1, one end of the capacitor Ⅰ 2 and one end of the capacitor Ⅱ 3, the anode of the diode Ⅰ 1 is connected to the turntable power supply VIN, and the other end of the capacitor Ⅰ 2 and the other end of the capacitor Ⅱ 3 are both grounded. The diode Ⅰ 1 plays a rectifying role, and the capacitor Ⅰ 2 and the capacitor Ⅱ 3 play a filtering role, making the circuit more stable and reliable.

[0027] In one embodiment of the utility model, it also includes capacitor III 5, diode II 6, capacitor IV 9, inductor 10, and diode III 12. One end of capacitor III 5 is connected to the BP pin of the power conversion chip 4, and the other end is connected to the S pin of the power conversion chip 4. The cathode of diode II 6 is connected to the S pin of the power conversion chip 4, and its anode is grounded. Capacitor IV 9 is connected in parallel with diode III 12. The anode of diode III 12 is connected to the other end of resistor I 7, and its cathode is connected to the S pin of the power conversion chip 4 through inductor 10. Capacitor III 5 plays a filtering role, diode II 6 and diode III 12 both play a rectifying role, which can protect the circuit, and capacitor IV 9 and inductor 10 play a filtering role together, making the circuit more stable and reliable.

[0028] In one embodiment of the utility model, a capacitor V 11 and a resistor III 13 are also included. The capacitor V 11 and the resistor III 13 are connected in parallel with each other, and one end of the capacitor V 11 is connected to one end of the resistor IV 14, and the other end is grounded. The capacitor V 11 plays a filtering role, and the resistor III 13 plays a voltage dividing role.

[0029] In one embodiment of the utility model, it also includes capacitor VI 15, capacitor VII 19, capacitor VIII 21, resistor VIII 23 and capacitor IX 24, one end of capacitor VI 15 is grounded, and the other end is connected to pin 2 of voltage reference chip 16, one end of capacitor VII 19 is grounded, and the other end is connected to the positive phase input terminal of voltage comparator 22, one end of capacitor VIII 21 is grounded, and the other end is connected to the negative phase input terminal of voltage comparator 22, and resistor VIII 23 and capacitor IX 24 are connected in parallel, and one end is connected to the positive phase input terminal of voltage comparator 22, and the other end is connected to the output terminal of voltage comparator 22. Capacitor VI 15, capacitor VII 19, capacitor VIII 21, and capacitor IX 24 all play a filtering role, and resistor VIII 23 is a pull-up resistor.

[0030] In one embodiment of the utility model, a capacitor X25 and a capacitor XI26 are also included. After the capacitor X25 and the capacitor XI26 are connected in parallel, one end of the capacitor is connected to the collector of the PNP transistor 30, and the other end is grounded. The capacitor X25 and the capacitor XI26 both play a filtering role, making the circuit more stable and reliable.

[0031] In one embodiment of the utility model, a diode V 34 is further included. The diode V 34 is connected in parallel with the resistor XII 35. The cathode of the diode V 34 is connected to the drain of the MOS tube 33, and the anode is connected to the turntable power supply VIN. The diode V 34 can protect the entire circuit from being impacted.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A turntable torque motor discharge protection circuit, It is characterized in that include: A power conversion chip (4), wherein its D pin is connected to the turntable power supply VIN, and its FB pin is respectively connected to one end of a resistor I (7) and one end of a resistor II (8), and the other end of the resistor I (7) is respectively connected to a power supply VCC, one end of a resistor IV (14) and an S pin of the power conversion chip (4); A voltage reference chip (16), wherein pin 2 is connected to the other end of the resistor IV (14), pin 3 is grounded, and pin 1 is connected to pin 2 of the voltage reference chip (16); A voltage comparator (22), wherein a non-phase input terminal thereof is connected to pin 1 of a voltage reference chip (16) via a resistor VI (18), and an inverting input terminal thereof is respectively connected to one end of a resistor V (17) and one end of a resistor VII (20), the other end of the resistor V (17) is connected to a turntable power supply VIN, and the other end of the resistor VII (20) is grounded; A PNP transistor (30), the base of which is connected to one end of a resistor XI (29) and the cathode of a diode IV (28), respectively; the other end of the resistor XI (29) is connected to a turntable power supply VIN; the anode of the diode IV (28) is connected to the output end of the voltage comparator (22) via a resistor IX (27); and the collector of the PNP transistor (30) is connected to the turntable power supply VIN; The MOS transistor (33) has a gate connected to one end of the resistor X (31) and one end of the resistor XI (32), respectively. The other end of the resistor X (31) is connected to the emitter of the PNP transistor (30). The other end of the resistor XI (32) is grounded. The drain of the MOS transistor (33) is connected to the turntable power supply VIN via the resistor XII (35), and the source is grounded.

2. The turntable torque motor discharge protection circuit according to claim 1, Features: The power conversion chip (4) is a LNK304DN type power conversion chip.

3. The turntable torque motor discharge protection circuit according to claim 1, Features: The D pin of the power conversion chip (4) is respectively connected to the cathode of the diode I (1), one end of the capacitor I (2) and one end of the capacitor II (3), the anode of the diode I (1) is connected to the turntable power supply VIN, and the other end of the capacitor I (2) and the other end of the capacitor II (3) are both grounded.

4. The turntable torque motor discharge protection circuit according to claim 1, Features: The invention also includes a capacitor III (5), a diode II (6), a capacitor IV (9), an inductor (10), and a diode III (12). One end of the capacitor III (5) is connected to the BP pin of the power conversion chip (4), and the other end thereof is connected to the S pin of the power conversion chip (4). The cathode of the diode II (6) is connected to the S pin of the power conversion chip (4), and the anode thereof is grounded. The capacitor IV (9) is connected in parallel with the diode III (12). The anode of the diode III (12) is connected to the other end of the resistor I (7), and the cathode thereof is connected to the S pin of the power conversion chip (4) via the inductor (10).

5. The turntable torque motor discharge protection circuit according to claim 1, Features: The invention also includes a capacitor V (11) and a resistor III (13). The capacitor V (11) and the resistor III (13) are connected in parallel with each other, and one end of the capacitor V (11) and the resistor III (13) are connected to one end of the resistor IV (14), and the other end of the capacitor V (11) and the resistor III (13) are grounded.

6. The turntable torque motor discharge protection circuit according to claim 1, Features: It also includes a capacitor VI (15), a capacitor VII (19), a capacitor VIII (21), a resistor VIII (23) and a capacitor IX (24), one end of the capacitor VI (15) is grounded, and the other end thereof is connected to pin 2 of the voltage reference chip (16), one end of the capacitor VII (19) is grounded, and the other end thereof is connected to the positive phase input terminal of the voltage comparator (22), one end of the capacitor VIII (21) is grounded, and the other end thereof is connected to the negative phase input terminal of the voltage comparator (22), and one end of the resistor VIII (23) is connected in parallel with the capacitor IX (24) and is connected to the positive phase input terminal of the voltage comparator (22), and the other end thereof is connected to the output terminal of the voltage comparator (22).

7. The turntable torque motor discharge protection circuit according to claim 1, Features: The voltage reference chip (16) is a TL431AIDBZR voltage reference chip, and the voltage comparator (22) is a LM2903DR2G voltage comparator.

8. The turntable torque motor discharge protection circuit according to claim 1, Features: The invention also includes a capacitor X (25) and a capacitor XI (26). The capacitor X (25) and the capacitor XI (26) are connected in parallel, one end of which is connected to the collector of the PNP transistor (30) and the other end of which is grounded.

9. The turntable torque motor discharge protection circuit according to claim 1, Features: It also includes a diode V (34), which is connected in parallel with a resistor XII (35), a cathode of the diode V (34) being connected to the drain of the MOS tube (33), and a cathode of the diode V (34) being connected to the turntable power supply VIN.

10. The turntable torque motor discharge protection circuit according to claim 1, Features: Resistor XII (35) is a 100W / 10R aluminum shell resistor.

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